LITHIUM-SULFUR BATTERY

To provide a lithium-sulfur battery which has a high first-time discharge capacity, a high first-time coulombic efficiency, and an excellent cycle property.SOLUTION: A lithium-sulfur battery comprises: a positive pole comprising a composite material comprising a porous carbon material and sulfur, the porous carbon material having a nitrogen content of 0.3 mass% or more, a specific surface area obtained by a BET method in a nitrogen adsorption-desorption method of 1000 m2/g or more, and a pore volume obtained by quenched solid density functional theory (QSDFT) of 0.45 cm3/g or more; a negative pole comprising lithium; and an electrolytic solution comprising a first solvent having a sulfonyl group, a second solvent, the second solvent being a fluorine-based solvent, and a lithium-containing electrolyte.SELECTED DRAWING: Figure 6 【課題】１回目放電容量が大きく、１回目クーロン効率が高く、サイクル特性に優れたリチウム硫黄電池を提供する。【解決手段】窒素含有量が０．３質量％以上であり、窒素吸脱着法のＢＥＴ法で得られる比表面積が１０００ｍ2／ｇ以上であり、急冷固相密度関数法（ＱＳＤＦＴ）により得られる細孔容積が０．４５ｃｍ3／ｇ以上の多孔質炭素材料と硫黄を含む複合材料を含む正極と、リチウムを含む負極と、スルホニル基を有する第一溶媒、フッ素系溶媒である第二溶媒及びリチウム含有電解質を含む電解液を有するリチウム硫黄電池。【選択図】図６